Large dispersive effects near the band edges of photonic crystals

Arnout Imhof, Willem L. Vos, Rudolf Sprik, Ad Lagendijk

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We have used phase-sensitive ultrashort-pulse interferometry to study the modification of optical pulse propagation near the photonic band edges in colloidal crystals consisting of polystyrene spheres in water. A strong suppression of the group velocity is found at frequencies near the L gap of the fcc lattice. The group velocity dispersion diverges at the band edges and shows branches of both normal dispersion and anomalous dispersion, which can be interpreted as large changes in the effective mass, both positive and negative. We obtain excellent agreement with the dynamical diffraction theory.

Original languageEnglish
Pages (from-to)2942-2945
Number of pages4
JournalPhysical review letters
Issue number15
Publication statusPublished - 11 Oct 1999
Externally publishedYes


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